발간논문

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Vol.32, No.4, 450 ~ 455, 1994
Title
Load - Controlled Tensile Properties of AISI 300 Series Stainless Steels at Cryogenic Temperatures
이해무Hae Moo Lee, 김시천Si Cheon Kim, 방건웅Gun Woong Bahng
Abstract
In case of cryogenic structures such as superconducting magnets and pressure vessels, the structural material experiences unrestricted force. It is, therefore, desirable to characterize the load-controlled tensile properties at cryogenic temperatures to simulate operating condition. At 4 K, however, discontinuous yielding occurs, which arises mainly from low specific heat and thermal conductivity of the materials at low temperatures, and it affects the load-displacement or stress-strain curves. In this study, load-controlled tensile tests were conducted at 77 ad 4K on AISI 300 series stainless steels. The load rate was varied from 5 to 5000 N/s. The effect of load rate and testing temperature on tensile properties of 300 series stainless steels were observed. A model which correlate discontinuous yielding and ultimate tensile strength was proposed.
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